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cos 3x = √2 - ½√2
cos 3x = ½√2
cos yang memiliki nilai ½√2 adalah cos 45 di kuadran I dan cos 315 dinkuadran 2, serta cos 405 di kuadrat I putaran ke 2
maka
3x = 45 ---> x = 15°
3x = 315 ---> x = 315/3 = 105°
3x = 405 ---> x = 135′
jadi jawabannbga 15°, 105°, 135°